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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be0b8da8cf3ccaddc603e5c7f43666feeee1edb83a7734fcf9bc2357f4b5cc5' 
  AND token = 'f8ZHQmwtPuH0euU7PS3ioW7m06ZNvD1QxYWbj0OUJ5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}